Module 6: Isarithmic Mapping

 Hello al, this week we learned about isarithmic maps, this is a type of thematic map used to depict continuous data like the weather phenomena we mapped during this lab. The map below shows the annual precipitation in Washington state between 1981 and 2010. The data depicted was collected and interpolated using PRISM (Parameter-elevation Regressions on Independent Slopes Model), this is a method that utilizes a digital elevation model (DEM) to accurately report precipitation. The map uses a hypsometric tint to show the precipitation data, the contour lines are used to express elevation. 

The areas in rea indicate less rainfall while blue indicates more rainfall in those areas. To make this map we used the raster data to show annual precipitation in inches and apply a continuous tone format with a precipitation color scheme. After copying this data we used a hillshade function to create a relief map and adjusted it using a dynamic range adjustment (DRA) to indicate elevation. Finally we used a hypsometric tint shade between the contour lines. Below is the result with the essential map elements.